Clearing of land for feed crop production and expansion of pastures for livestock production has been one of the driving forces behind deforestation.

为饲料作物生产清理开垦土地，为畜牧生产扩大牧场，成为毁林的动力之一。

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The raising of livestock such as cows, pigs and sheep occupies two-thirds of the world's farmland and generates 20% of all the greenhouse gases driving global warming.

牛、猪、羊等家畜的增长占据了全世界农田的三分之二，并且生成的导致全球气候变暖的温室气体展全球温室气体的20%。

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Any motorist driving along a country road at night must stop every mile and send up a rocket signal, wait 10 minutes for the road to be cleared of livestock, and continue.

任何在晚上沿著乡间道路开车的驾驶人，每英里就要停下车来施放火箭信号、等待10分钟让路上的家畜被清空后继续驾车前进。

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But much of the cynicism is centered on corn-based ethanol that some consider not just an inefficient fuel source but also one that also creates food shortages, driving up the cost of feed for livestock producers.

FORBES: Can Ethanol Cut Foreign Oil Imports?